Today's biggest winners and losers in the stock market.
On this episode of Stock Movers:

• MongoDB (MDB) shares are down 20% in extended trading, after the database software company gave a full-year revenue forecast that is weaker than expected. It also gave an outlook for adjusted first-quarter earnings that is below the analyst consensus.
• Defense contractors rallied. L3Harris Technologies added 2%, Lockheed Martin advanced 3.3%, Northrop Grumman gained 4.8%, and RTX rose 4.7%.
• Palantir Technologies (PLTR) advanced 5.8%. The data-analytics giant counts the U.S. government among its biggest customers and maintains a relationship with Israeli security agencies.MongoDB (MDB) shares are down 20% in extended trading, after the database software company gave a full-year revenue forecast that is weaker than expected. It also gave an outlook for adjusted first-quarter earnings that is below the analyst consensus.